Charging unit



FIG. 1 is a perspective front view of a charging unit showing our new design;

FIG. 2 is a perspective rear view of FIG. 1; and

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a top view thereof.

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a side view thereof. 

CLAIM The ornamental design for a charging unit, as shown and described. 